<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>v-for指令</title>
</head>

<body>
    <div id="app">
        <input type="button" value="添加数据" @click="add" />
        <input type="button" value="移除数据" @click="remove" />
        <ul>
            <li v-for="(item,index) in arr" :title="item">
                {{ index+1 }}黑马程序员校区：{{ item }}
            </li>
        </ul>
        <h2 v-for="item in vegetables" v-bind:title="item.name">
            {{ item.name }} : {{ item.price }}
        </h2>
    </div>
    
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el: "#app",
            data: {
                arr: ["北京", "上海", "广州", "深圳"],
                vegetables: [
                    {name: "西蓝花炒蛋", price:10.9},
                    {name: "回锅肉炒肉", price:20.5}
                ]
            },
            methods: {
                add: function () {
                    this.vegetables.push({name:"花菜炒蛋", price:11.5})
                },
                remove: function() {
                    // this.vegetables.shift();
                    this.vegetables.pop();
                }
            }
        })
    </script>
</body>
</html>